Whenever a document is going to be included into the textual database, a semantic binder is used to associate the document with one or more semantic nodes which are defined in a semantic taxonomy. The touch sensing unit includes a plurality of first sensing pads and second sensing pads. The movable section is adapted to axially rotate relative to the housing to move the movable section between a first portrait position and a second landscape position. For example, the connection includes a secure authenticated channel established using an initial set of identifier information stored in the device.